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glow worm clicking on&off every 3-4 mins?

Hi I have a glow worm fuel saver f, the problem is that it heats up fine (water+heating) then it keeps clicking on and off all day at three mins intervals.also the thermostate in the hall only clicks on and off between 15 -20c are these related problems or seperate.
many thanks
keiron
keiron, January 2010